Reply To: Hi, My wife has auto-immune hypothyroid. Her serum VitaminD level is 11.3 ng/dl which is quite low. In contrast to this her serum calcium level is 10.48. What dose of vitamin D is recommended for her? I am just afraid that her calcium levels are already at border line and may increase once she intakes Vitamin D supplements! Is this true? Please advise

If her calcium levels are “slightly” high has she been diagnosed with any other issues that would cause this? At this website http://endocrinesurgery.ucla.edu/patient_education_High_Calcium.html it gives causes of high blood calcium levels. One of the first things they would check is her PTH levels to see if she has primary hyperparathyroidism. If she has been checked and these levels are within range, then I do not believe that Vitamin D will cause her levels to rise. This website also says that “In rare cases of severe thyroid disease, blood calcium levels can become imbalanced.”
So having said the above she should probably take the 5000 iu that the Vitamin D Council recommends and try and get her levels to at least 50 ng/ml. (This could take an amount that is higher than 5000 iu.) I highly recommend you read http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-and-other-vitamins-and-minerals/ (Magnesium is very important!)
Let us know if you have any problems!